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  1. Health & Medicine

    Wet fingers always wrinkle in the same way

    Pruney fingertips aren't swollen sponges — the wrinkles actually come from blood vessels constricting and pulling skin inward.

    By McKenzie Prillaman
  2. Paleontology

    Sloths once came in a dizzying array of sizes. Here’s why

    A new fossil and DNA analysis traces how dozens of sloth species responded to climate shifts and humans. Just two small tree-dwelling sloths remain today.

    By Carolyn Gramling
  3. Health & Medicine

    It’s tricky to transplant a bladder. How surgeons finally did it

    The person who received the bladder is doing well, and the successful transplant could offer hope to thousands of people with bladder dysfunction.